Swage for use in oil-wells



- W. S. PIERCE.

Il.. RENEWED JUNEzI. |919.

Patented Jan. 6,1920.

V/ I. f

IMI IIIIII swAGE ron use IN oIL wELLs. I

A APPLICATION FILED IULY 31, I9 1,327,491.

UNITED sTATEs oFiIIoE. 'if

WILLIAM s. PIEE'CE, or FRANKLIN, PENNSYLVANIA.

sWAGE Een UsE IN oInwELLs.

specineatin of Letters raient.

Application led July 31, 1917, Serial No. 183,719. .Renewed June 21, 1919. Serial No. 305,872.

To all whom t may concern.'

Be it known that I, IVILLIAM S. PIERCE, a citizen of the United States, residing at Franklin, in the county of Venaiigo and State of Pennsylvania, have invented cer tain new and useful Improvements in Swages for Use in Oil-Vells; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My present invention relates to improve ments in swages for use in oil wells or the like. In these wells the casing is apt to become weak through rust and corrosion, and since this casing must bear its own weight as well as that of the pumping apparatus, and more or less pressure from the outside also, when it becomes weakened to a certain point it collapses and crumbles.

At the point where the collapsing takes place the casing is often very much inutilated and slivered, the points of metal projecting inwardly in various shapes.

These collapsed portions form obstructions iii the Well, and it is desirable to open up these obstructions in order to provide a passage for a packer, a casing cutter, or other device to be used at a point under that at which such collapsing has occurred.

My present invention consists in the construction of such a device as will open up a collapsed casing, and the invention will be more fully understood by reference to the accompanying drawing, in which:

Figure 1 shows a section through the well casing, the inner tube being shown in elevation and the swage block being shown partly in section and partly in elevation;

Fig. 2 shows a section along the line 2 2 of Fig. 1, and looking down; and

Fig. 3 shows a section through the axis of the swage block. a

A represents the well casing which is shown as crumbled in at a. B represents the inner tube made up of sections in the usual way, which sections are connected together by the coupling rings C.

When the parts are assembled, these rings form, in el'ect, set collars spaced at equal distances on the inner tube B.

Mounted on one of the sections of this inner tube B, between a pair of these coupling rings C, is the swage block I), which is preferably in the form of two truncated cones joined at their bases, these two cones being provided with wedging surfaces al, 0l and with striking ends (Z2, which are adapted to engage the coupling rings C.

These swage blocks are bored so as to slide freely on any one of the sections oi' the inner tube, between adjacent coupling rings.

The operation of the device is as follows:

The collapsed portion a of the well casing bein located, the inner tube is pulled up a si icient distance, the swage block is put on, and the inner tube is lowered down again with the swage block mounted thereon. When the swage block meets the obstruction a it will be raised, and the entire weight of the inner tube, with the parts carried thereby, will strike a blow like a great hammer on the upper end of the swage block, and will wedge it down through the crumbled portion of the casing. rIihe blow may be repeated as often as desired, by raising the inner tube and letting it fall again.

By having the swage block tapered in both directions, as shown at d, d', it may be wedged upward through the crumbled p0rtion of the well casing by hoisting up on the inner tube.

While the inner tube forms a convenient mounting for the swage block, it will be obvious that similar results, as herein described, may be accomplished by using, instead of the inner tube, any rigid member which can be lowered into the well, and is provided with set collars between which the swage block is slidably mounted.

In either case there will be a downward jar or hammer blow b letting the inner member fall, causing tie upper collar to strike the swage block, while the upward jar may be produced by hoisting the inner member upward, causing the lower collar to strike the lower edge of the swage block.

Patented Jane, 1920. Y.,

While I have shown the angle of the two lli) ably mounted on said tube between a pair of adjacent collars, the said swage block being substantially in the form of two truncated cones with their bases joined, the maximum transverse diameter of the swage block being slightly less than the inner diameter of the Well casing to be expanded, the said swage block having an axlal bore slightly larger than the periphery of the member Whereon said sWage block slides, the ends of said swage block being adapted to be struck by one or the other of said collars as said tube is raised or lowered, subf-rstantially as described.

In testimony whereof, I aiix my signature.

WILLIAM S. PIERCE. 

